有关用Hiberate实现增加商品的问题

Question

还是增加商品时报错：Hibernate: insert into epai.dbo.goods (goods_name, goods_price, goods_pic, goods_desc, saler_id, begin_time, end_time, buyer_id, goods_status) values (?, ?, ?, ?, ?, ?, ?, ?, ?)
2009-5-20 22:10:34 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
org.hibernate.TransientObjectException: com.yourcompany.struts.entity.User
at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:216)
at org.hibernate.type.EntityType.getIdentifier(EntityType.java:108)
at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:221)
at org.hibernate.type.TypeFactory.findDirty(TypeFactory.java:476)
at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:2803)
at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:467)
at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:190)
at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:113)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:195)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at com.yourcompany.struts.dao.hibimpl.BaseHibernateDAO.add(BaseHibernateDAO.java:27)
at com.yourcompany.struts.dao.hibimpl.GoodsDAOHibimpl.add(GoodsDAOHibimpl.java:13)
at com.yourcompany.struts.biz.impl.GoodsBizImpl.addGoods(GoodsBizImpl.java:21)
at com.yourcompany.struts.action.GoodsAction.doAdd(GoodsAction.java:61)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

Answer 1

配置文件<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping package="com.yourcompany.struts.entity">
    <class name="Goods" table="goods" schema="dbo" catalog="epai">
        <id name="goodsId" type="java.lang.Long">
            <column name="goods_id" />
            <generator class="native" />
        </id>
        <property name="goodsName" type="java.lang.String">
            <column name="goods_name" length="50" not-null="true" />
        </property>
        <property name="goodsPrice" type="java.lang.Double">
            <column name="goods_price" scale="4" not-null="true" />
        </property>
        <property name="goodsPic" type="java.lang.String">
            <column name="goods_pic" length="500" />
        </property>
        <property name="goodsDesc" type="java.lang.String">
            <column name="goods_desc" length="3000" />
        </property>
       
       <many-to-one name="saler" class="User">
        <column name="saler_id" not-null="true"></column>
       </many-to-one>
       
        <property name="beginTime" type="java.sql.Date" >
            <column name="begin_time" length="23" />
        </property>
        <property name="endTime" type="java.sql.Date">
            <column name="end_time" length="23" />
        </property>
        
       <many-to-one name="buyer" class="User">
        <column name="buyer_id" not-null="true"></column>
       </many-to-one>
       
        <property name="goodsStatus" type="java.lang.Integer">
            <column name="goods_status" not-null="true" />
        </property>
        
        <set name="bids" inverse="true" lazy="false">
         <key>
         <column name="goods_id" not-null="true"/>
         </key>
         <one-to-many class="Bid"/>
        </set>
    </class>
</hibernate-mapping>

Answer 2

不好意思，刚贴错了配置文件，要贴的是这个
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping package="com.yourcompany.struts.entity">
    <class name="Goods" table="goods" schema="dbo" catalog="epai">
        <id name="goodsId" type="java.lang.Long">
            <column name="goods_id" />
            <generator class="native" />
        </id>
        <property name="goodsName" type="java.lang.String">
            <column name="goods_name" length="50" not-null="true" />
        </property>
        <property name="goodsPrice" type="java.lang.Double">
            <column name="goods_price" scale="4" not-null="true" />
        </property>
        <property name="goodsPic" type="java.lang.String">
            <column name="goods_pic" length="500" />
        </property>
        <property name="goodsDesc" type="java.lang.String">
            <column name="goods_desc" length="3000" />
        </property>
       
       <many-to-one name="saler" class="User">
        <column name="saler_id" not-null="true"></column>
       </many-to-one>
       
        <property name="beginTime" type="java.sql.Date" >
            <column name="begin_time" length="23" />
        </property>
        <property name="endTime" type="java.sql.Date">
            <column name="end_time" length="23" />
        </property>
        
       <many-to-one name="buyer" class="User">
        <column name="buyer_id"></column>
       </many-to-one>
       
        <property name="goodsStatus" type="java.lang.Integer">
            <column name="goods_status" not-null="false" />
        </property>
        
        <set name="bids" inverse="true" lazy="false">
         <key>
         <column name="goods_id" not-null="true"/>
         </key>
         <one-to-many class="Bid"/>
        </set>
    </class>
</hibernate-mapping>

Answer 3

many to one里加上cascade="save-update"吧，我估计是你要插入的那个数据在哪个表里没有

Answer 4

我改成 <many-to-one name="saler" class="User" cascade="save-update"> 
<column name="saler_id" not-null="true"></column> 
</many-to-one> 以后，报这样的错误： not-null property references a null or transient value: com.yourcompany.struts.entity.User.userName 我userName 怎么会为空呢，明明有东西的啊

Answer 5

1.你把那个为空的字段打印出来看看到底有没有值。
2.把not-null="true" 改为false试试！
应该就可以解决了！

Answer 6

userName不为空，把not-null="true"改成false也没用

Answer 7

用户User的配置文件：<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping package="com.yourcompany.struts.entity">
    <class name="User" table="t_user" schema="dbo" catalog="epai">
        <id name="userId" type="java.lang.Long">
            <column name="user_id" />
            <generator class="native" />
        </id>
        <property name="userName" type="java.lang.String">
            <column name="user_name" not-null="true" />
        </property>
        <property name="userPassword" type="java.lang.String">
            <column name="user_password" not-null="true" />
        </property>
        <property name="userIdCode" type="java.lang.String">
            <column name="user_id_code"  not-null="true" />
        </property>
        <property name="userTel" type="java.lang.String">
            <column name="user_tel"  not-null="true" />
        </property>
        <property name="userAddr" type="java.lang.String">
            <column name="user_addr" not-null="true" />
        </property>
        
        <property name="userZip" type="java.lang.String">
            <column name="user_zip" not-null="true" />
        </property>
        
        <property name="userStatus" type="java.lang.Integer">
            <column name="user_status" not-null="true" />
        </property>
    </class>
</hibernate-mapping>